Work-holder and centering device therefor.



No. 660,486. Patented Oct. 23, I900.

J. W. BROWN, IR. WORK HOLDER AND CENTERING DEVICE THEREFOR.

(Application filed Nov. 16, 1899.) (No Model.) 2 Sheets-Sheet l,

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=Patented Oct. 23, I900.

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J. W. BROWN, 18.

WORK HOLDER AND OENTERING DEVICE THEREFOR.

(Application filed Nov. 16, 1899.) i N 0 M 0 d e l a device which willautomatically center work -making the desired out and returning, and atUNITED STATES PATENT OFFICE.

JOHN WILSON BROWN, .13., or PHILADELPHIA, PENNSYLVANIA.

WORK-HOLDER AND CE NTERING DEVICE THEREFOR.

SPECIFICATION forming part of Letters Patent No. 660,486, dated October23, 1900.

Application filed November 16, 1899.

T0 ttZZ whont it may concern;

Be it known that I, JOHN WILsoN BROWN, Jr., a citizen of the UnitedStates, residing in Philadelphia, Pennsylvania, have invented certainImprovements in Work-Holders and Centering Devices Therefor, of whichthe following is a specification.

The object of my invention is to construct and hold it in a centralposition while a cutting-tool is operating and which will free the workimmediately after the tool has finished cutting. This object I attain inthe following manner, reference being had to the accompanying drawings,in Which- Figure 1 is a sectional view of a cuttingtool, showing myimproved work-centering device. Fig. 2 is an inverted plan view. Fig. 3is a sectional view illustrating my invention slightly modified andapplied to a screwthread cutter; and Fig. i is a section on the line 44:, Fig. 3.

My invention is especially adapted for use in connection with automaticmachines that is, machines in which the Work to be out is mounted inposition and after the work is in position the mechanism is started, thecutters the end of the return-stroke the mechanism will stop to allowtheattendant to remove the finished work and insert another blank.

Referring to,,;Fig. -1, A is ,the cutter-head, and A a block restingwithin the cutter-head. B is a spindle having a shoulder b, and on thespindle is a nut b. Thecutter-head and block are confined between theshoulder and the nut, as clearly shown in Fig. l.

Carried by the block A are cutters o 0. These cutters are held inposition by screws 0, adapted to a flange of the head A. D is anextension of the spindle B. This extension has a portion (1, which inthe present instance enters the work as shown in Fig. 1.

Mounted on the extension D is a sleeve E, provided with a flange e atits lower end and has a tapered upper end 6, which fits the work at apoint not to interfere with the cuttingtools. The sleeve rests upon acollar or nut 61, secured to the extension D, and the upper end of thesleeve is guided by the enlargement of the spindle. Mounted within theSerial No. 737,197. (No model.)

sleeve, between its flange e and the end of the spindle B, is a springF, which tends to force the sleeve away from the cutters. I I are thesupports for the work to he cut. The work is shown in Fig. 1 by dottedlines. If, for instance, a large number of pieces of the form shown bydotted lines, Fig. 1, are to be finished by cutting either the end orthe inner or outer surface of a portion of the piece or if the piece isto be threaded, the sleeve is made to fit the piece at top and bottom,as shown, and the supports are formed to engage the piece and prevent itfrom turning, yet will allow the piece to center itself on the sleeve.

When the spindle. B is raised, the entire mechanism is above fthesupport 11, so that a piece can be placed in position on the support I.As the spindle is lowered'the sleeve E will enter the piece untilitseats itself, as shown, centering the piece in reference to the cutter,and as the spindle B continuesto descend the spring will be compressed,thus keeping the piece in position while the cutters c 0 out the outerface of the projecting rii When the out has been mad dle, with itscutters, raised be relieved, and, finally, the withdrawn from the pieceand'another piece can be inserted.

In Figs. 3 and 4 I have shown a modification of the device. A washer dholds the sleeve in place against the pressure of the spring F. Theupper end of the sleeve is adapted to the enlarged portion 1) of thespindle. Carried by the spindle is a screw-thread cutter c of the formas shown in Fig. 4. This cutter is adapted to a tapered portion 11 ofthe spindle and is held in place by a nut 0 adapted to the threadedportion of the spindle. In this figure I have shown a sleeve having atapered portion e at the lower end as well as at the upper end. Thusafter the piece is placed in position on the support and is preventedfrom turning byalug or projection the spindle is driven down into thepiece, the sleeve E will seat itself at two points, and thus center thepiece in respect to the cutter, and as the spindle continues itsdownward movement the cutters will cut an internal thread on the piece,as shown by the dotted lines, and after the spindle has traveled acertain distance the driving mechanism is reversed and the spindle iswithdrawn, freeing the piece, so that it can be removed and anotherpiece placed in position.

It will be seen that the centering device can be adapted to a spindle orhead having a cutter of any form, and it can be so arranged that it willcenter the piece to be cut immediately before the cutter acts andrelieve the piece immediately after the cutter acts, thus savingconsiderable time in placing,centering,

and clamping the piece.

I claim as my invention-- 1. A cutter-head having a yielding extensionor mandrel arranged to enter the work before the cutter engages thesame, said inandrel bearing against the Work at two or more points bothbefore and during the time that go the cutter is in operation andthereby holding the work in alinement, substantially as described.

2. The combination of a cutter-head,a spindle, an extension on thespindle centrally set in respect to the cutter, a sleeve mounted on theextension and adapted to engage the Work, and a spring between thesleeve and the spindle, substantially as described.

3. The combination of a spindle, a cutter 0 mounted thereon, a stemprojecting beyond the cutters, a sleeve adapted to the stem and to thelower portion of the spindle, a spring between the spindle and aninternal flange on the sleeve, and a stop to limit the outward dle, anextension on the spindle, a sleeve mounted on the extension, a portionof the sleeve being tapered to fit the piece to be alined, substantiallyas described.

5. The combination of acntter-head,a spindle, an extension on thespindle, a sleeve mounted on the extension, a collar or shoul der on thespindle, and an internal flange on the sleeve, a spring mounted betweenthe collar andinternal flange, and a guide for the upper end of thesleeve, substantially as described.

6. The combination of a spindle, a cutterhead mounted thereon, thespindle extending beyond the cutter-head, a collar or flange on thespindle, a sleeve adapted to slide upon the rod the collar limiting theoutward movement of the sleeve, a spring between-the internal flange ofthe sleeve and the spindle, the upper portion of the sleeve beingtapered to fit the piece to be cut, and an extension adapted to centerthe lower portion of the piece, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

JOHN WILSON BROWN, JR.

Witnesses:

WILL. A. BARR, J os. H. KLEIN.

